Power-drill



1. 1v1. ROBERS'ON POWER DRILL.

APPLlcMloN man FEB.

Spt. 9, 1919.

Hmmm@ Patented JOHN ivi. RoBERsoN, or

' PATNT SEATTLE, WASHINGTON.

rovina-DRILL.

iiaiee.

Application led February To all whom 1i/may concern:

Be it known that I, JOHN M. RoBnRsoN, a citizen of the United States, residing at Seattle, in the county of King and `State of lVashington, have invented a new and useful Improvement in Power-Drills, of which the following is a specification.

This invention relates to improvements in drills, and more particularly to oil well drills, and the object of this improvement is to provide a drill for shaping the Walls of the cut to the same diameter as the outer shell or casing.

A further object resides in theprovision of a motor vfor actuating vthe drill housed within the drill casing.

A still further object resides in the pro-v vision of an automatically actuated coml pressed air chamber having communicating means with the reduction gear compartment for expelling liquid therefrom forced Within the chamber by the high atmospheric pressure from without.

Still further objects will appear from the 'following specication, reference being had to the accompanying drawings wherein is soughtv to be illustrated only an embodiment of such operable mechanism as may be employed to carry into effect the functions and aims of the invention, the scope of which beino more clearly pointed out in the appended c aim.

In the drawings, Figure 1 is an elevation of'the drill and associated mechanism j Fig. 2 is an elevation' of the drill proper in part section, showing the application of the reamer attachment; Fig. 3 is a plan AView 0f the drill drawn along lines 3. 3 of Fig. 2; and Fig. 4 is 'a plan detail ofthe hollow float chamber.

Referring more particularly to the drawings, in which like numerals indicate like parts in all the figures, the numeral 1 represents an ordinary outer casing shell as employed in oil drilling, and 2 is an inner chamber wherein is disposed theassociated drill mechanism. The outer casing 1 is herein designed to freely telescope'the inner chamber 2 which is' sustained against circular movement byribs 3 .which engage similar ribs 4 providedon the outer Walls of the chamber 2. These ribs 3 and 4 serve as a means for centering the inner chamber 2 equidistant from the walls of the outer casing and permit of longitudinal movement onlytherebetween.

Specification of Letters Patent.

Patented sept. e, raie.

5, 1918. serial No. 215,725.

7 is asimilar closedy compartment within the chamber 2 wherein 'is disposed the motor S securely anchored to the sides of the cha'mf.

bei' in any well known manner.

The motor 8 receives its electrical energy through wire (not shown) which may `fol low the cable 5 upwardly to the source of supplyonthe surface. 8 is the drive shaft from tliemotor which carries a gear 9 keyed thereto and this gear meshes with larger gear 10 keyed upon the counter shaft 11. Power from the motor is transmitted through4 tliesegears to the smaller gear 12, whiclrin. turn transmits the power through ineslied gear 13 of the secondary drive shaft 14 to the small gear 1'5 on the lower end thereof. The gears 9, 10,

-12` and 13 are herein shown as partitioned.

olf within the chamber 2, by partition walls 16 and 17, and these partitions serve as a` bearing for the drive and counter shaftsl 8 and l1 respectively.

'Further reduction of the power is transf mitted from the gear 15 to the larger gear 18I with which it meshes, -keyed on the secondary counter shaft 19,'thence through smallergear 20- of the secondary counter shaft to the larger gear 2 1, keyed to the' shaft 22 connected directly with the drill.

drill shaft 22. However, it is to be underv stood that many obvious means for preclu'ding rotary movement of the shaft 22.

within the sleeve 25 canbe'provided. It is further obvious that many well known forms of gear reduction can be employed to perform the functions necessary for actuating the drill. i

The sleeve 25. is extended throughthey lower portion of the inner chamber 22 and upon the end thereof is rigidly secured the cylimlrically shaped outer casing 29. lVithin this casing is disposed the drill which. adapted. to be longitudinally movable thereinprimarily to actuate. the reamers 3 1 to be i more ltully hereinafter described.

32 are longitudinal slots provided in the inner casing 330i: the drill core, for the rereception ot pins 3l secured to the outer casingzl). This provision is to securely lock the two casings together against independent rotary movement.

are cuttingteeth provided on the tlange portion ot' the inner casing 33, and 3G are similar cutting teeth provided on'an elongated extension 3T ot the inner core.v The provision ot this lower drill serves to center the apparatus against rotary oscillation.

The reamers 31, above referred to. ot which there may be twoor more, are pivotally attached to the inner core of the casing 2E) and are adapted to extend outwardly through longitudinal slots 3S provided in the walls ot the casing 29 `to a point tlush with the outer telescoping shell 1 The provision ot' these reamels is tor the purpose. ot' enlargingl the diameter ot the hole in'eviously cut by the teeth 35 ot the drill to equal the diameter of the shell l wherebv the same can be, lowered to follow the drill.

These reamers ire held in operative position by lthe core ot' the inner casing` 33 which comes in Contact.)therewith when the same is urged upwardly by the pressure ot' the rotary drilling operation.

Yhen it is'desired to withdraw the drill upwardly through the outer shell l, thel pins 3l are caused to come in contact with the run at the upper' end ot' the slots 82.

vThe reamers are thus permitted to swing .with the drill operating below certain depths from the earths surface, yexternal pressure forces water through the stuliing boxes into the gear mechanism. That ditlieulty is over come b v the provision of the col'npressed air receptacle (5 having greater atmospheric resistance than the atmospheric pressure trom without` and all water that seeps 'through the stutling boxes will be expelled from the chamber by the automatic action ot' the valve. 4,3, which caused tolbe opened or llosed by the water raising the float chamber and actuating the toggle `ioint 4l, which actuates the valve and opens the port l5 and admits the air vinto the compartment having the water. This pressure forces the valve lo to open, and the lwater in the compartment is expelled through the valve.

Itis to be understood that various meehanical constructions can be designed to automatically open and close the compressed'airreceptacle and expel the water from the chamber.

What I claim as new, and desire to protect by Letters Patent., is:

A drill comprising an outer shell. an inner chamber adapted to be longitudinally` movable within said outerr shell, a compressed air receptacle and a motor disposed' within, said inner chamber, a drill operatively connected with said motor exteriorly Ot' said inner chamber.'and means for automatically permitting` the escape of air from Asaid receptacle into said chamber for expelling water therefrom. forced within by external atmospheric pressure.

Signed by me at Seattle, lashingtom this 29 day of January, 1918.

JOHN bl. ROBERSON.

'Witnesses DORA C. KUHNS, RICHARD J. Coon. 

